Porous Carbon Nanospheres and MXene Nanocomposites for Enhanced Energy Storage Devices

Abstract

AbstractIn the present work, we prepared the porous carbon nanosphere from a biomass precursor (CNS) and made a composite of CNS with MXene (Ti3C2Tx) in various ratios. All the CNS:Mxene composites were electrochemical evaluated in three‐electrode system in 3M KOH electrolyte solution with techniques, such as cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). The 6:4 CNS:Ti3C2Tx MX ratio was found to exhibit excellent electrochemical performance with a higher specific capacitance of 527.5 Fg−1 at a current density of 0.25 Ag−1. A symmetric device study was carried out with 6:4 ratio of CNS:Ti3C2TxMX composite in S4R‐SS316 type Swagelok cell. The device exhibited a maximum specific capacitance of 45.0 Fg−1 at a current density of 0.25 Ag−1, with a higher power density of 2500 Wkg−1 and very low energy density of 6.25 Wh Kg−1. Thus, the electrochemical performance of the CNS/Ti3C2Tx MX composite exhibited a combined electrical conductivity from the MXene, and the porous nature and significant surface area from CNS, which improved the wettability implying the potential of CNS:MXene composites for enhanced energy storage.